No, it's not a laptop. I didn't notice any slowdown due to the hardware. Its PC is used only for periodically running few wallets and for backing up personal files. even most of the time it is turned off.
the same configuration worked for several months, without major problems.
although it often happened that flip keywords in the validation period were not loaded, which can be frustrating.
Both your PC and internet connection are great. But I have no idea what would cause node to restart in your case. I have never seen this kind of behaviour.
In any case, next validation should be way easier for everyone, since network has split into shards for validation transactions. That means your node will not communicate as much as before and it should go more smoother.
For that part, "words not loading" it's not up to you, nothing you can do about it but try to wait if the words will load. What causes words not to load? People who run node on bad pc or bad connection, their node loses connection to the network and node is not able to send decryption keys to you so their flip words can be shown to you.
By waiting, you are waiting for a chance if that someone will be able to reconnect their node and it will try to send you decryption keys again.